Radioactive Mutant Vampire Bunnies

using System;
using System.Collections.Generic;
using System.Linq;

namespace Radioactive_Mutant_Vampire_Bunnies
{
    class Program
    {
        static int rows;
        static int cols;
        static List<int> list = new List<int>();
        static char[][] matrix;
        static int pRow;
        static int pCol;
        static bool live = true;
        static bool win = false;
        static void Main()
        {
            var nxm = Console.ReadLine()
                .Split(' ', StringSplitOptions.RemoveEmptyEntries)
                .Select(int.Parse)
                .ToArray();
            rows = nxm[0];
            cols = nxm[1];
            matrix = new char[rows][];
            for (int row = 0; row < rows; row++)
            {
                matrix[row] = new char[cols];
                var input = Console.ReadLine()
                    .ToCharArray();
                for (int col = 0; col < cols; col++)
                {
                    matrix[row][col] = input[col];
                    if (matrix[row][col] == 'P')
                    {
                        pRow = row;
                        pCol = col;
                    }
                    else if (matrix[row][col] == 'B')
                    {
                        list.Add(row);
                        list.Add(col);
                    }
                }
            }
            var comm= Console.ReadLine();
            foreach (var cha in comm)
            {
                Move(cha);
                Spare();
                if (win)
                {
                    Print();
                    Console.WriteLine($"won: {pRow} {pCol}");
                    break;
                }
                if (!live)
                {
                    Print();
                    Console.WriteLine($"dead: {pRow} {pCol}");
                    break;
                }
            }
        }

        private static void Spare()
        {
            var n = list.Count;
            for (int i = 0; i < n; i += 2)
            {
                for (int row = -1; row < 2; row++)
                {
                    for (int col = -1; col < 2; col++)
                    {
                        var r = list[i];
                        var c = list[i + 1];
                        if (!((row ==  0 && col ==  0) ||
                              (row == -1 && col == -1) ||
                              (row == -1 && col ==  1) ||
                              (row ==  1 && col ==  1) ||
                              (row ==  1 && col == -1)))
                        {
                            if (IsIn(r + row, c + col))
                            {
                                if (matrix[r + row][c + col] == 'P') live = false;
                                matrix[r + row][c + col] = 'B';
                                list.Add(r + row);
                                list.Add(c + col);
                            }
                        }
                    }
                }
            }
        }

        private static void Move(char ch)
        {
            switch (ch)
            {
                case 'U': Direkt(pRow - 1, pCol - 0); break;
                case 'D': Direkt(pRow + 1, pCol - 0); break;
                case 'R': Direkt(pRow - 0, pCol + 1); break;
                case 'L': Direkt(pRow - 0, pCol - 1); break;
            }
        }

        private static void Direkt(int r, int c)
        {
            matrix[pRow][pCol] = '.';
            if (IsIn(r, c))
            {
                if (matrix[r][c] == 'B')
                    live = false;
                else
                    matrix[r][c] = 'P';
                pRow = r;
                pCol = c;
            }
            else
                win = true;
        }

        static bool IsIn(int r, int c)
        {
            if (r >= 0 && r < rows && c >= 0 && c < cols)
                return true;
            else
                return false;
        }
        private static void Print()
        {
            foreach (var row in matrix)
            {
                if (row.Any())
                    Console.WriteLine(string.Join("", row));
            }
        }
    }
}